Just-In-Time (JIT) Production


The basic idea behind just in time production is to eliminate stockpiles of inventory during production. It was first introduced and implemented in Japan to eliminate wastes of machines, materials, capital, manpower and inventory during manufacturing. But it was first implemented on a large scale at Toyota Motor Company in 1953 and give it a name Kanban which means visible record.

Just-In-Time (JIT) Goals:

  •  Receive supplies just in time to be used.
  •  Produce parts just in time to be made into sub assemblies.
  •  Produce sub assemblies just in time to be assembled into final products.
  •  Produce and deliver finished products just in time to be sold.

Just in time


There are two Approaches of manufacturing

  • First Approach is Push System which defines as the parts are made in batches, placed in inventory,and used whenever necessary which is also known as Traditional manufacturing.
  • Second Approach is Push System parts are produced to order, and the production is matched with demand for the final assembly of products.

There are not at all stockpiles of inventory and Scheduling is done based on demand at the same time. Parts are inspected by the worker as they are manufactured and are used within a short period of time, maintaining continuous production control and meeting quality standards at the same time.

Implementation of Just In Time Production requires Great Advanced Planning and Preparation. Also all aspects of manufacturing operations be reviewed and monitored continuously. This way we eliminate idle and unnecessary resources,  produce high quality products and  increase teamwork among workers.


Kanban


As mentioned earlier term first used by  Toyota Motor Company in 1953. Kanban consists of two cards:
  • Production Card -  It authorize worker to manufacture specified part and a lot size at workstation. Part no., Quantity and workstation are mentioned in production card.
  • Move Card - It authorizes to transfer parts from one workstation to other workstations for the next operation. 

Although in modern production practice we use only one card in which both production and transfer details are mentioned. These are completely replaced by bar codes and RFIDs in many companies now a days.





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